nested Middleware is not allowed (found pages/_middleware)

[michalstrzelecki]

Verify canary release

• I verified that the issue exists in Next.js canary release

Provide environment information

Operating System:
  Platform: linux
  Arch: x64
  Version: #49~20.04.1-Ubuntu SMP Wed May 18 18:44:28 UTC 2022
Binaries:
  Node: 16.5.0
  npm: 7.21.1
  Yarn: N/A
  pnpm: N/A
Relevant packages:
  next: 12.1.7-canary.24
  react: 18.1.0
  react-dom: 18.1.0

What browser are you using? (if relevant)

No response

How are you deploying your application? (if relevant)

No response

Describe the Bug

I am using react 18 and next canary release. When I create middleware page and run npm run dev I get:

error - nested Middleware is not allowed (found pages/_middleware) - https://nextjs.org/docs/messages/nested-middleware

in the console.

Expected Behavior

I want to be able to use middleware feature with react 18.

To Reproduce

https://github.com/michalstrzelecki/nestedMiddlewareIsNotAllowed

[matamatanot]

Check #36772
/pages/_middleware -> /_middleware

[balazsorban44]

This is intended and as pointed out above implemented in #36772.

A small correction to the above, the filename should be middleware.{js,ts}, without an underscore.

[github-actions]

This closed issue has been automatically locked because it had no new activity for a month. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.